Let's forget the physical gun for a while and look at the data Mangrove was able to find about an m/28 rifle with serial number 13420.
The whole mess started in Varsinais-Suomi CG district in March 1930. A random group of issued m/24 rifles had been damaged in the line of duty. The SY wanted refund. In this letter dated March 24, 1930 in Turku the Varsinais-Suomi district HQ reports about the incoming payment.
Section 4. says this:
"Kiväärin m/24 No 9372 / S. - on Marttilan sk. korvannut Smk:lla 340:-." or "Marttila Civil Guard has refunded 340FIM to compensate the m/24 No 9372 / no S number."
Next, there is SY's reply dated April 15, 1930. The SY states that the refund has been accepted and damaged rifles are to be replaced by new m/28 rifles. The new rifles are delivered with bayonets, frogs and muzzle protectors.
In the end of the letter it says this:
"Turmeltuneista ja korvatuista kivääreistä oli yksi, teht. No 9372/S.-, ilman S-numeroa, sen tilalle tullut kivääri M/28 on myöskin S-numeroitava ja numero ilmoitettava Yliesikunnalle. Ilmoituksen k.o. S-numerosta on oltava Yliesikunnassa viimeistään 22.4.30." or "One of damaged and refunded rifles, No 9372/S.-, was without an S number. Its replacement must be S numbered and the number must be reported to the SY by April 22, 1930."
Here, the master armorer of the Varsinais-Suomi district reports that they have received a new m/28 rifle with serial number 13420 to replace the Marttila CG damaged/refunded m/24 No 9372. This new m/28 has been marked with an S number 19899. Date of the letter is April 24, 1930.
Here is the SY acceptance book featuring an m/28 with serial number 13420. The rifle was fitted with "K" or koivu (birch) stock and was high pressure proofed by "R" or Uuno Rauhala (both of these are true to my gun). No one zeroed the rifle at the factory (tark. amm. suorittaja). Then there are later (?) pencil marks that the complete rifle was accepted by "E" or Kosti Eskola. However, there is no date of inspection in the book and my gun does not have <-(KE)-> inspection mark! Finally the rifle was delivered to "22" or Varsinais-Suomi CG district on April 16, 1930. This is more than a year later than all the other rifles on this page. The other guns were also marked "ilm." or ilmainen (free of charge) which means paid by the SY (or the Finnish Government).
Here comes the ordnance book of Marttila Civil Guard. Ending date of this book No 1 is October 22, 1934.
On left-hand page there is
"Ylläolevan kiv. korjaukset vuosina 1927-31" or "repairs related to rifle above during 1927-31". The master armorer states April 25, 1930 that the rifle was renewed by Sako and refers to the letter mentioned earlier. Then August 18, 1930 he says that a wood-covered cleaning rod stuck in the barrel was removed at the district arms workshop.
On the same page there is also
"Alue- tai paikallispäällikön huomautukset" or "comments of regional or local chief". On June 2, 1930 it says that the rifle was sent to district arms worshop for cleaning rod removal. Must be the same wood-covered rod. Then there comes markings of rifle maintenance inspections. First one is dated by regional chief on October 27, 1931. Result of inspection was 0/10 where "0" means brand new, unissued bore while "10" means best possible gun care. Following maintenance inspection was held a year later, after the rifle was issued, and is dated October 21, 1932. The result of maintenance inspection was I/10 where "I" means issued bore in best possible condition. (Please notice, results of maintenance inspections weren't stamped to the rifle buttplate, only results of technical inspections were stamped.) On October 27, 1933 yet another maintenance inspection was held and the result was I/4 where "4" stands for worst possible gun care with notice "minor corrosion 10cm from the muzzle". Finally on October 10, 1934 inspection the result was again I/10. The records of this rifle were then continued in ordnance book No 2, starting October 22, 1934.
On right-hand page of book No 1 there are
"Piirin tarkastajan huomautukset" or "comments of district inspector". First one is 0/10 inspection by the master armorer dated April 25, 1930. This is the rifle unissued and right after arrival. Then there is another inspection of still unissued rifle held by 2nd military instructor on January 8, 1931. The result was 0/10. Then finally there is yet another inspection held by 2nd military instructor on March 27, 1934. This would be the first technical inspection after the rifle was issued. The rifle condition was I/10 where "I" is bore condition.